Chemical Engineering MCQs

Page No. 215

Ratio of pressure and inertia force gives ______________ number?


aWeber

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bMach

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cEuler

✓


dFroude

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View Answer Euler

Most commonly used joint in the underground pipe lines is the________________?


aSleeve joint

✓


bCoupling

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cFlange

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dExpansion joint

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View Answer Sleeve joint

Gear pump_________________?


aIs a positive displacement pump

✓


bIs a centrifugal pump

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cIs a non-positive displacement pump

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dCan be started with delivery valve closed

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For a particle settling in water at its terminal settling velocity, which of the following is true ?


aBuoyancy = weight + drag

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bWeight = buoyancy + drag

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cDrag = buoyancy + weight

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dDrag = weight

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In a fully turbulent flow (Re > 105) in a pipe of diameter ‘d’, for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is_______________?


ad

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bd2

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cd2.5

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dd4

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View Answer d2.5

______________ pumps are axial flow pumps?


aTurbine

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bPropeller

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cDiffuser

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dNone of these

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View Answer Propeller

Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time’t’. α = a co-efficient to be experimentally determined) ?


aε = ε0 + α.t

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bε = ε0 + α.t2

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cε = ε0 + α.t3

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dε = ε0 + α.t4

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View Answer ε = ε0 + α.t

The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is_____________________?


a0.5

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b1

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c1.5

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d2

✓


View Answer 2

Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will______________________?


aIncrease

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bDecrease

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cRemain same

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dData insufficient to predict pressure drop

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View Answer Increase

Which of the following denotes the effect of compressibility in fluid flow ?


aWeber number

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bMach number

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cEuler number

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dReynolds number

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View Answer Mach number

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